410 
TurspAY Morninc, AUGUST 2IST. 
Prof. B. D. Halsted exhibited photographs of variegated leaves 
made by the Solandi method, the description of the same having 
been published in a former number of the BULLETIN. 
Prof. C. E. Bessey spoke for «A better Pronunciation of botani- 
cal Terms.” After citing examples of inconsistent pronunciation, 
the speaker suggested Percey Miles’ essay written for Nicholson's 
Gardener’s Dictionary as a guide, 7. ¢. the adoption of the Roman 
method of pronunciation; although it is consistency that is de- 
sirable rather than any particular: method. Prof. N. L. Britton 
moved that a standing committee on pronunciation be appointed, 
the members to be named by the President. The motion was — 
carried. , 
Prof. B. D. Halsted spoke briefly on “The Peach-spotting 
Fungus as.a Leaf-parasite,” stating that the fungus effects numer- 
ous perforations in the peach leaves. | : 
Mr. E. J. Durand presented notes on“ The Development of 
Olpidium sp., one of the Chytridiacee.”’ This plant is parasitic on 
Spirogyra. The uniciliated zoospores work their way into the in- 
terior of the algal cell, where they grow in size and acquire a wall 
as the sporangium. The cell of the host is much swollen by the 
sporangium or several sporangia which occur within it. When 
the fungus approaches maturity a tube is given out from one side 
of the sporangium which extends to some distance outside the 
cell of the host, at the same time the protoplasm of the fungus 
becomes divided up into ciliated zoospores which finally escape 
through the tube by the rupture of its apex. see 
Prof. B. D. Halsted exhibited leaves of Peonia discolored by 
some disease whose cause he had ascertained to be not from 1 
sects. He asked for suggestions from anyone as to its caust 
Dr. E. F, Smith explained a method for making pure cultures °° : 
fungi. The method consists in the usual distribution of = aes i - 
agar or gelatine to be poured subsequently into a Petrie dish 
When the gelatine has become solid, the dish is inverted 0” cai | 
stage of a microscope, a single spore found and surrounded by ee ; 
ring of ink on the bottom of the dish. The disk of gelatine” 
_ then cut out, put into another dish and fresh nutrient SO” 
